1.adjectiveBeing in a healthy condition; not deranged; thinking rationally.
"a sane mind"
2.adjectiveMentally sound; possessing a rational mind; having the mental faculties in such condition as to be able to anticipate and judge the effect of one's actions in an ordinary manner.
"a sane person"
3.adjectiveRational; reasonable; sensible.
"Try to go to bed at a sane time before your exams."